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Investments In and Advances To Affiliates (Details) - USD ($) $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 09, 2018 | Jan. 01, 2018 | Nov. 15, 2017 | Jul. 25, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  | $ 2,837 | $ 2,693 | $ 8,114 | $ 7,887
Operating margin |  |  |  |  | 671 | 640 | 1,927 | 1,820
Income (Loss) from Equity Method Investments |  |  |  |  | $ 6 | $ 24 | 31 | 33
Minority Owned Affiliates [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 734 | 532
Operating margin |  |  |  |  |  |  | 119 | 91
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  | 36 | 44
Simple Energy [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 35 |  |  |  |  |  |  |
sPower [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 2.00% | 48.00% |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired |  |  | $ 19 | $ 461 |  |  |  |
Fluence [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Payments to Acquire Interest in Joint Venture |  | $ 7 |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  | 50.00% |  |  |  |  |  |
Business Combination, Consideration Transferred |  | $ 50 |  |  |  |  |  |
Non-cash [Member] | Fluence [Member] |  |  |  |  |  |  |  |
Investments in and Advances to Affiliates [Line Items] |  |  |  |  |  |  |  |
Contribution of Property |  | $ 20 |  |  |  |  | $ 20 | $ 0

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